Plants on rock or terrestrial, forming clumps. Stems radially symmetric, underground (rhizomatous) and aerial, not readily fragmenting, irregularly forked; rhizomatous and aerial stems often with 1 branch arrested, budlike, tips straight; aerial stems erect or occasionally ascending. Rhizophores borne on upperside of stems, restricted to rhizomes and lower 1/3 of aerial stems, 0.3--0.4 mm diam. Leaves dimorphic, not clearly ranked. Rhizomatous stem leaves persistent, tightly appressed, scalelike. Aerial stem leaves appressed, ascending, green, linear-lanceolate to narrowly lanceolate, 2.2--3.8 X 0.29--0.4(--0.75) mm; abaxial ridges present; base abruptly adnate, cordate to almost peltate, pubescent or sometimes glabrous; margins short-ciliate at base, denticulate toward apex, cilia white to transparent or greenish, spreading at base, ascending toward apex, 0.02--0.08 mm; apex keeled, bristled; bristle puberulent, rough, transparent to whitish, 0.23--0.75 mm. Strobili solitary, (0.4--)1--1.5 cm; sporophylls ovate-lanceolate to lanceolate, abaxial ridges not prominent, base glabrous, margins short-ciliate to denticulate, apex bristled. 2 n = 18.
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